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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d3909848f8a04478654aa0dda3927ac902c51aa3dd5e67db282130e9a3d4db' 
  AND token = 'ovq0jlaUD5H65iof8RshyY1IRawCzjliZXpVPAjIXaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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