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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197fb0928d283584d6dc1106455b2f518d3480e6877f5169e5b703d763df2e86' 
  AND token = 'Ey/NwMJyrGuJkzjV6/ZAyjIDsCSNLteB0Qsyxyz/8io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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