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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc84be674fccc5d214dbc9fb2ef69eefae8a3344be8406c34f9147736990e8d' 
  AND token = 'jLbxQcqhTP574Xn8pF3h5l7jKYp3i5PDhvGFKnVtu90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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