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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b5b91a38d4e909cb6d07b0adbcad96251fafcf4e3d1579ba9a17056a6bf791' 
  AND token = 'fWIXgxU2Ex9p4xeB55K74gc+O6XqMN2XIs2LKdApM58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}