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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0224d8c9c8447e243314d24e8c7ec9c24b9a9025b510312fbd605d54969c0b1' 
  AND token = 'Ai3X1hzvQ/9yz+EFp1FRWZgcvQpnAfSM/HD8l4ePUig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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