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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef236632c7aa76dad6a68b755d757c93fdef6ae70ac17a9098c0030433b4368e' 
  AND token = 'cq7Zi7xAU0ekuFyObRls2k+y46cKEOuVskDHJI1cr2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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