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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd292dcbca620b31d5c0029e75fe652f694ec30071739e11192b0cf1608380e2b' 
  AND token = '0ROvpJ4VrnbWQ1/R0Ev6JTN4iamtzu8um8jNXpUAvWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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