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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7736a619cd71fefc5a3c92441c261ae1d9d715e1065c034230f1db8ce25b856' 
  AND token = 'gBhPiWOWdQa31EbsBVdNXW4e9dwiWPRFEbNnDQGAp44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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