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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cbf42b5de9ed92349672c958ee006820d0855fed7ffde21363ef6f2fe26df6' 
  AND token = 'STPRnzvPKEyR5BfrHnhrAOH7X757t1TcaaN8Dtz1yhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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