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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0962aa969f7b1562d3d3a7aa62ce7c342f4b67330048d7d81f25eaf15a78c136' 
  AND token = 'sQRRI+12g+LWAmCZpLkH9RnD8z5yL7W+Lmaa942b19Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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