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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf104b2c2157a0a4bbe9c0fae74d771b3ba2b51e662c9c208c22511228189c97' 
  AND token = 'L5UFp0Twbpgs3rXjTuTPspZmwOpJZ2YNzt6g4Dre/m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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