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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c5460586970a6f561b6d1bde347a9906ef0170f093b831fbec95b05acf54b3a' 
  AND token = 'blSzKr6nAVvsVq5lgjmPMexQ8Aw9zShMSwteM16H97Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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