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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee956cb2981baa3fb8e09446edcf5133327b1671bacab104b6ba8c8b24ef09f' 
  AND token = 'xyvt3+M06J+GRAetIcM/8pkYTBN4+Apffj1AnCDcDWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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