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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7beca855cb7dcd17a97a7d3ca56d9b2298ef430ef9404d7a8503d4e367a5615c' 
  AND token = 'BafwkxZKNpNUOIX50+HmYH4Fw2u6bxXs9wOAz/P1w6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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