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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4df4a31bae2bc5bd772be4edd7a6cae02b09660dbfe1e09d1c2f74c914d1d4' 
  AND token = 'UtY2lJTABq6UgdGhxi+hKVc1sADtY2qQk/e+ii4dfdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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