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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0883a1bf74c5c2d4dbdc530f076d57119fd0791b63dac97dfc277a152a47ff' 
  AND token = 'yGp1xARrTRRDPMjnM4wurwvhGcYl2ffL3tphFMfZA3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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