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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5d084db4a015674a485f946cf82b65a1e754cb495cf55f94505afe2b1b7697' 
  AND token = 'FPWEN1v2tz5v3BMkinOYB4d5VL8DEnQbu6OO5LlaqFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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