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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8c1ee590903cec296f4ac63f19f31d4817ba2f5e0c8d007cfb1522da8d3f90' 
  AND token = 'q02EhV6QjkPdSnzN2Vqwgg1KjUweL2Q7CovRG2Q4VGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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