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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c11a147daa3c2e35795ecb31bdbb372b6622e492590499c8ca56e69ade7091' 
  AND token = 'EXxycYM6x1Xm38I+gSNGn4xXPmoMU9vmuo7/gLuKxg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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