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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcce8ed593578125a239f3f2df70c3d2de1767badc1b06b24f1e1e806bd87d7f' 
  AND token = 'rPiIbqse00qIPbxj2miqGGYwe+X9G7YpqKNk+4NnKPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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