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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911d6de2bfee10bda78fb0c5dcb6de7a0ec8b8eb290ede99d4bac0dd83d04f7c' 
  AND token = 'WRQYmOtDVxvikFE3R2LEXbh2UWYTu61LZ1Sitvn7y2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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