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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519f2b0c9b3b8d560ef35706837f27af6a16b4d4668121d526abc605c9736231' 
  AND token = 'dbFWGm0e+b53+095k4T4jD/zYmsqSGXRrqLJqjzLyFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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