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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3437baa51df2b0356fd9bfc50edaa46b1ce2d9134f0da3f538cd7d4a6b1dfc' 
  AND token = 'efeTNBqxTJcLJdFL0Dmn5Q6hsm5uwWfScqJA3545f+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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