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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0984aad303a99641eb066598cc7f7ce1c1613ac39821494e3a5d68af91f4c43' 
  AND token = 'eCda3CA4+0JM5A+RNybZPi0GS7Tzu2T2m2Q0m3GcgE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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