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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96f13b40683213885f4bd1cf78c48fee3d2a95f9c9d9cdd6f62fda32a39cf12' 
  AND token = '6Gpwiv31Q+8eh7cDzpdN6K39HMZX4z9IfQGC3NU+kuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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