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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd7d642167f2871cbbd9a62cb7e1e82d5401220f3974e713fd1651505b64ad5' 
  AND token = 'EVjPHzRPQqEt2Z7c9ck6duhKQFAnAXX6PbASe61Pobc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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