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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c623358e790e745f1f4e15365e407fbef4a97217ccd109987cb69c900f1f924' 
  AND token = 'ENQjbtNTbLBHBBmugEyUVhNG0MwFDyb8Qzb18PWaN+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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