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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd00e5946fb8621208f4c2cf4d02bddc006f16ba5a1ca19af49e035767f7daaa' 
  AND token = 'vHZA/0LjTJMlvtoHLh8Ii/SbWqb/ssMPd5rUwluJecc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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