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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb27586f6f6683504aac65471a5d065d4114ad1892880f894f4f00cbaaeceed5' 
  AND token = 'w4CT1+/l2i1XqfODP5vtEQqxYj1Ml3YJZGvisoQrTiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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