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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e0a0a6befa3abe78c12d79dd89b80cf32de264d6b41eaefad6448dda19e536' 
  AND token = 'pAvIB2bxoRK74xGvYZnW7C/ef8/wNSQ7Y2G4mHrqdh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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