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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d0fc0e3094765755d916eb30c72dea7be809e937fb1fbe66a0e9ade2fde0b5' 
  AND token = 'sbnyra7LqEPpw5nkbvETD3dxCofKwQPtrtRy9cTHQaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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