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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674c3568038ac2f366e6006dba07c94aac9969679808ac2e60ac1701600fe838' 
  AND token = 'BM+iCiclDt7+Ofp+8AHt4ZZxDYc4fWwG+Nv319G8iAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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