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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b978051336d786c07c5fbbcdd7f01beb2a04555284214961304a82d5abc59c72' 
  AND token = '9q8pTKdf/7kfU7oWR2xWG127onFe5gUuHvZSZqbB2YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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