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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b0c22d8f01b8ae2edbaa23320f3797c8f3f807c6227269f021661b9518b2f6' 
  AND token = 'f3ZB+P8pz9e+gyClr0hocGUlThbAIT36zE+AcShvZlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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