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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1fb5eba72ede6753507011124e7db5938a9c6ec300b9354670dcf3a5a17184' 
  AND token = 'AqhTjGe80aE4Lyv1Lr5o+N1MxTU6s77FVDu4oLyV79A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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