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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa35161aa49b109a25626a94aeb8f0873662a5d1bcaba91e3923d5ef9b99bbc' 
  AND token = 'Y4c56GyEC00RxN/gG28hsC9Qwf+gxPzPn/fNcHlZD6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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