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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b47cbd1b3d5d9dca03dc7e257dd8790c6cdf093f205337b1a5fafa0bff1c3c3' 
  AND token = 'EVyVn7LqG+2gOLy47DBeit4//Yhk8z4JG2jndFi1y40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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