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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830d7f4840e51613339d6b0b511dc2c0fffd22b1d1190e59ec4a7aed4208be45' 
  AND token = 'J776obXTBmOczctyVAAdN0W3KLmpMYAwP6MzB7OEJ4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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