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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d912c654a8e3e6b1a76bde673e1a6870929566870ede40db6695fb6ee8313d0' 
  AND token = 'onZLbDIz0asUVKzNTbkYZm41h1lITLU+iXndeCq8c7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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