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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d1c382b088233fd6ac46cf807716df9664f2f5ed118cf967bc594f041c0006' 
  AND token = '4zSiWWiHDr4p+6wcd2srO2M7DnWOpXla9aK1ya4Fchc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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