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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1460146feff326ef09d23633afd2af62755812fdeb4f1724bcf2ce3e22c24b4c' 
  AND token = 'OSpGrDHKEGiTdYjVLm+mLry7QvJUjsb58Nf+s9mSrMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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