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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ef37e1b334fa9cebc35763114b6afea9a53f899bd667c69ab39b806c438d5b' 
  AND token = '987rE1laGvj+8wBl3RtB8vY08Wd3wXxqHaiJ2Pqw0fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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