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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d0afbf37bc26b6c115fe0b9061b1061abbdeffe7702b89a67e8c237c9dbaa1' 
  AND token = '481b2yvB8QIDa28U4LzLGU3KZZFTTnGCEtJHOCwvH3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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