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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93313ec690baca6d4b5c90ab4093d3b3aeb35d41b884dbf8f4fb91327082ff48' 
  AND token = 'Yb4p/0c1s1g1yLHusHsQ6UvLwrNP4rdVlCzVUh7UCQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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