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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b66553efb10a948e0bf39f9aaad23052bb7c5a23a2d5bae937425275dd47d68' 
  AND token = 'gE+Nhkl+MeNzfU40kPjgWjA6eGz2/4rUTXLAWQD6Tjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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