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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d139c14ccc4e82a91b274f6b813e6639fe23ac3a94f4d11a50d00d22decbeb' 
  AND token = 'bESqlbkAej+MGyU/BA9RL1n2vV5HL2u/IodCNzON8JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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