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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59297b82b7af2692e5804fb02fee5aa2f89ea2e3c80eb76ec65f1062d3640aa' 
  AND token = 'o2d9AIKHQH6aqGup7focmeIEsV7Eq7P6Co5A4LVruO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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