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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d52d53ff1343d30569a72ae192d3a1768b8a5cc132e6c7eb3181b7123d5f3d3' 
  AND token = 'FV8OjE5cH0cqchoadPSahzug9k0+V7/KqPjTnM9Niis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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